Were developed by Royal Rife, one of the originators of this bio-technology. These devices transmit specific electronic signals to deactivate or destroy living pathogens, bacteria, and cancers. Rife also developed special electron microscopes. Rife machines have been outlawed by the FDA, but some clinics like American Metabolics use them in treatment. http://www.rife.org for more information. There is also a Rife Forum at Subscribe: Rife-subscribe@yahoogroups.com.